Which of the following is commonly used to detect chromosomal abnormalities?

Electrocardiograms (ECGs) are tests that measure the electrical activity of the heart. They are primarily used to diagnose heart conditions, such as arrhythmias and heart attacks, rather than chromosomal abnormalities. Thus, they are not relevant for detecting genetic issues in fetuses.

Magnetic resonance imaging (MRI) provides detailed images of organs and tissues within the body using magnetic fields and radio waves. While it can assess structural abnormalities, it does not analyze chromosomal makeup or detect genetic disorders, making it ineffective for identifying chromosomal abnormalities.

X-rays are a form of radiation used to visualize the internal structure of the body, particularly bones and certain tissues. Although they can reveal some developmental issues, they do not provide information about chromosomal structures or genetic conditions. Therefore, they are not suitable for detecting chromosomal abnormalities.